| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. H Urday vs M Sion Castro |
| 1-0 | 66 | 1991 | Palma de Mallorca Open | A15 English |
| 52. Javier Suarez vs M Sion Castro |
| 0-1 | 34 | 1991 | Palma de Mallorca Open | D03 Torre Attack (Tartakower Variation) |
| 53. M Sion Castro vs J Galiana Salom |
| ½-½ | 38 | 1991 | Palma de Mallorca Open | C63 Ruy Lopez, Schliemann Defense |
| 54. M Sion Castro vs L Cisneros Belenguer |
| ½-½ | 59 | 1991 | Palma de Mallorca Open | C11 French |
| 55. M Sion Castro vs J Campos Moreno |
| 0-1 | 49 | 1991 | Palma de Mallorca Open | C97 Ruy Lopez, Closed, Chigorin |
| 56. C Brull Mayol vs M Sion Castro |
| ½-½ | 36 | 1991 | Palma de Mallorca Open | D85 Grunfeld |
| 57. M Sion Castro vs W Arencibia Rodriguez |
| ½-½ | 49 | 1991 | Leon | C18 French, Winawer |
| 58. M Todorcevic vs M Sion Castro |
| 0-1 | 59 | 1991 | Leon | A07 King's Indian Attack |
| 59. M Sion Castro vs J Magem Badals |
| ½-½ | 30 | 1991 | Leon | B18 Caro-Kann, Classical |
| 60. M Sion Castro vs J L Fernandez Garcia |
| ½-½ | 29 | 1991 | Leon | C80 Ruy Lopez, Open |
| 61. M Sion Castro vs J de la Villa Garcia |
| 0-1 | 48 | 1991 | Leon | C18 French, Winawer |
| 62. M Sion Castro vs L Bass |
| ½-½ | 22 | 1991 | Leon | C95 Ruy Lopez, Closed, Breyer |
| 63. A Romero Holmes vs M Sion Castro |
| 0-1 | 37 | 1991 | Leon | B46 Sicilian, Taimanov Variation |
| 64. E Prie vs M Sion Castro |
| ½-½ | 20 | 1991 | Leon | B44 Sicilian |
| 65. Vladimirov vs M Sion Castro |
| 1-0 | 34 | 1991 | Leon | A34 English, Symmetrical |
| 66. J de la Villa Garcia vs M Sion Castro |
| 1-0 | 66 | 1992 | Leon | B32 Sicilian |
| 67. M Sion Castro vs Tukmakov |
| 1-0 | 24 | 1992 | Leon | B89 Sicilian |
| 68. Yudasin vs M Sion Castro |
| 1-0 | 49 | 1992 | Leon | B44 Sicilian |
| 69. M Sion Castro vs M Illescas |
| ½-½ | 46 | 1992 | Leon | B44 Sicilian |
| 70. A Romero Holmes vs M Sion Castro |
| 1-0 | 27 | 1992 | Leon | B45 Sicilian, Taimanov |
| 71. J Magem Badals vs M Sion Castro |
| 1-0 | 27 | 1992 | Leon | B33 Sicilian |
| 72. M Sion Castro vs Z Franco Ocampos |
| ½-½ | 30 | 1992 | Leon | B57 Sicilian |
| 73. M Sion Castro vs D Garcia Ilundain |
| ½-½ | 21 | 1992 | Leon | B89 Sicilian |
| 74. M Sion Castro vs Gulko |
| 0-1 | 44 | 1992 | Leon | B57 Sicilian |
| 75. M Sion Castro vs Vaganian |
| 1-0 | 27 | 1992 | 2nd Principe de Asturias rapid | C16 French, Winawer |
Kibitzing
